Snapshots of the components of velocity perpendicular (left panels) and parallel (right panels) to the magnetic field for simulation 2G, for the MHD case (upper panels) and ambipolar case (bottom panels), taken at 198.1 s. This can be compared with the rightmost panels in Fig. 16, where we showed v_z at the same time. The horizontal gray and black dotted lines present in the panels at the right hand side located at the heights z = 1.25 Mm and z = 1.5 Mm represent the equipartition layer and the reflection height, respectively. Above the reflection height the only wave which propagates is the slow mode, with the velocity oscillating along the magnetic field lines, observed in the right panel.